Hydraulic motor for deep-boring mechanisms



Feb. 22, 1938.

T. SEIFER HYDRAULIC MOTOR FOR DEEP BORING MECHANSMS Filed NOV. 26, 19352 sheets-sheet 1 Feb. 22, 1938. T. sElFER HYDRAULIC MOTOR FOR DEEPBORING MECHANISMS Filed NOV. 26, 1935 2 Sheets-She@- 2 J @nm PatentedFeb. 22, 1938 PATENT OFFICE HYDRAULIC MOTOR. FOR DEEP-BORING MECHANISMSTheo Seifer, Berlin, Germany Application November 26, 1935, serial No.51,633 In Germany February 27, 1935 9 Claims.

taking place when the auxiliary valve is opened or closed.

The main valve is according to not only released from pressure but mayalso be protected against the concussions of moving Water, because asmall span of time intervenes between the closure of one valve and thatof the other, the cylinder already rising in the meantime and beingcharged with water, (provided that the dimensions are correspondinglychosen).

Referring now to the drawings which are for illustrative purposes only,

Fig. 1 is a vertical cross-section through a part of the cylinder, thelatter being in its highest position.

Fig. 2 shows the same parts a's Fig. 1, with the cylinder in its lowestposition.

Fig. 3 illustrates another modification.

Fig. 4 shows the valve according to Fig. 3, the cylinder assuming itslowest position.

Fig. 5 illustrates a complete boring mechanism including the chisel.

In Fig. 1, a is the hollow boring tubing through which the `flushing anddriving water is introduced into the cylinder. b is the cylinder of thehydraulic motor which is firmly connected lwith the chisel and in whichthe piston d may slide. The piston d is xed to the tubing The pistondivides the interior of the cylinder into two chambers. e are openingsin the tubing a through which the ushing water` enters the upper chamberof the cylinder. f1 and fz are ducts through which the flushing water istransferred to the lower chamber of the cylinder b. The tubing a iswidened beneath the piston d to form a chamber in which the main valvegz and the secondary valve g1 are arranged. The

valve g1 is firmly connected to the valve rod h1 on which a collar i isprovided. A c I inder l closed by a bottom m is concentrically c nnectedwith the cylinder b. In the bottom m ducts for leading the water to thechisel are provided. At

l its upper and lower` end the cylinder l is equipped my invention withcollar-like enlargements n. At the lower end of the tubing a, levers o1and o2 are fulcrumed cooperating with the rest i and sliding with rollsq on the outer surface of the cylinder l. T1, T2, T3 are controllingsprings of which r1 rests on the control rod h2. s is a bore in thevalve g2.

When the valves gi and g2 are closed the water ows from the tubing ainto the interior of the cylinder b above the piston d (position'shownin Fig. 2). The cylinder is lifted together with the chisel (Fig. 5). Itpushes upwards the rod h2 which strikes upon the lower end of the rodh1. On further raising the cylinder b the spring n is more and morecompressed, the levers o1 resting on the upper side of the collar i. Assoon as the .lower enlargement n of the cylinder l reaches the rolls q,the latter are displaced aside and the collar i is released from thelevers o1. Now the compressed spring r1 may open the valve g1 so thatthe water is allowed to flow olf from the chamber formed above the valvey1.

The valve g2 was hitherto pressed upwards against its seat, its lowersurface being greater than its upper surface. The hydraulic pressure cfthe water was, during this period, assisted' by the spring r3. After thevalve g1 is opened a hydraulic pressure acts upon the upper surface ofthe valve gz, the bore s letting less water flow 01T than the quantityof water flowing in through the tubing a. After opening the valve g2 theushing water flows off rapidly through the ports f1 down to the chiseland the cylinder sinks down under the action of its own weight. The

rolls q again roll off on the middle part of the .a cylinder l, thelevers 01 taking a position beneath the collar z' and keeping the Valveg1 opened even when the compression of the spring rl ceases. Thisposition of the levers and valves is illustrated in'Fig. 1 in which therests of the levers 01 are shown lying under the collar i. The valve y1is closed only when the rolls g roll upon l the upper enlargement of thecylinder l and the levers oi again release the collar i whereupon thehydraulic pressure again acts on the lower surface of the valve gz thatis now likewise closed.

In Figs. 3 and 4 the surfaces of the valve chamber which are touched bythe surfaces of the valves when closed are in another position than inthe modification shown in Figs. 1 and 2.

In4 Figs. 3 and 4, a is the hollow tubing, b the cylinder sliding on thepiston d. e is an opening in the tubing a through which the iiushingwater is introduced into the cylinder above the piston. f1 and f2 areopenings through which the ilushing water flows from the interior of thetubing a beneath the piston d into the cylinder b.

' g1 is the auxiliary valve and yz the main valve. h1 and 'hz are thetwo parts of the valve rod. Part h1 is provided with a` collar i. l is acylinder connected with cylinder b and provided Y valve g1 is closed bythe valve rod hi, h2 and the Vspring T1 when the cylinder has beenraised. Now the valve yz is thrown upwards because the lower surface isgreater than the upper one. The flushing water now largely runs out andthe cylinder drops down. Hereby the spring r1 is released and in thecorresponding relative position o f Athe roll q and the cylinder thevalve g1 Yis pressed downwards and opened by the hydraulic pressure andYunder the action oiA the spring r2 so that now the water pressurebeneath vthe valve 9': is reduced and the valve y2 is closed,

whereupon the cylinderis again lraised'.

By dividing the valve rod into two sections h1 and h2 it is possible toinsert any desired free play between the lowest position of the cylinderand its position in the moment when the compression of the spring r1begins.

As shown in Fig. 4, the valve g2 may be shaped to form a solid body, inwhich case the duct s` may be formed by a cavity in the wall of 'thetubing connecting the space beneath the valve gz with the space abovethis valve. r3 is a closing spring'in Figs. 1 and 2 and an openingspring in Fig. 3.

I claim 1. In a boring mechanism, the combination of a tubing throughwhich the flushing `iiuid flows, a piston on the said tubing, a cylindersliding over the piston, a main valve in the said tubing, a chamber inthe tubing beneath the valve seat, apertures being provided in the saidchamber for the discharge of the iiushing iiuid, an auxiliary valve inthe said chamber, a rod extending from the body of the auxiliary valveand a second rod adapted to be lifted with the cylinder and adapted tostrike the rst named rod thereby opening the auxiliary valve after thecylinder has passed a certain way from its lowest position, the mainvalve being actuated by the variations of the hydraulic pressureconnected with the opening and closing of the auxiliaryvalve.

2. In an impact boring mechanism actuated by flushing iiuid thecombination c-f a tubing, a. piston mounted thereon, a cylinder slidablymounted on said piston, a boring tool carried byv said cylinder andvalve means for reversing the flow of lluid to said cylinder to causereciprocation thereof, said valve means comprising a main valve 4and anauxiliary' valve in said tubing, a chamber adapted to be closed by themain valve, a second chamber beneath the rst one adapted to be closed bythe auxiliary valve both chambers being provided with outlet ducts, arod extending from the body of the auxiliary valve and adapted to belifted by the cylinder to open the auxiliary valve after the cylinderhas passed a certain way from its lowest position, the main valve beingcontrolled by the variation of the hydraulic pressure in connection withthe opening and closing of the auxiliary valve. I

3. In an impact boring mechanism actuated by flushing fluid thecombination of a tubing, a piston mounted thereon, a cylinder slidablymounted on said piston, a boring tool carried by said cylinder and valvemeans for reversing the iiow of fluid to said cylinderto causereciprocation thereof, said valve means comprising a main valve in thesaid tubing provided with an axial bore of a diameter smaller than theinner diameter of the tubing, an auxiliary valve in the tubing beneaththe main valve, a chamber adapted to be closed by the main valve, asecond chamber beneath the iirst one adapted to be closed by theauxiliary valve both chambers being provided with outlet ducts, the mainvalve being controlled by the variation of the hydraulic pressure inconnection with the opening and closing of the auxiliary valve.

. 4. In an impact boring mechanism actuated by ushing iiuid thecombination of a tubing, a piston ymounted thereon, a cylinder slidablymounted on said piston, a boringl tool carried by said cylinder andvalve means for reversing the ilow of fluid to said cylinder to causereciprocation thereof, said valve means comprising a main Valve in thesaid tubing the body of which has a lower surface greater 'than itsupper surface, an auxiliary valve in the tubing beneath the main valve,a chamber adapted to be closed by the main valve, a second chamberbeneath the iirst one adapted to be closedY by the auxiliary valve bothchambers being provided with outlet ducts, the main valve beingcontrolled by the variation of the hydraulic pressure in connection withthe opening and closing of the auxiliary valve.

5. In an impact boring mechanism actuated by flushing iiuid thecombination of a tubing, a piston mounted thereon, a cylinder slidablymounted on said piston, a boring tool carried by said cylinder and valvemeans for reversing the flow of uid to said cylinder to causereciprocation thereof, said valve means comprising a main valve in thesaid tubing the body of which is provided with an axial bore of adiameter smaller than the inner diameter of the tubing and has a lowersurface greater than its upper surface, an auxiliary valve in the tubingbeneath the main valve, a chambenadapted to be closed by the main valve,

a second chamber beneath the rst one adapted to be closed by theauxiliary valve both chambers being provided with outlet ducts, the mainvalve being controlled by the variation of the hydraulic pressure inconnection with the opening and closing of the auxiliary valve.

6. In an impact boring mechanism actuated by iiushing fluid thecombination of a tubing, a piston mounted thereon, a cylinder slidablymounted on said piston, a boring tool carried by said cylinder and valvemeans for reversing the flow of uid to said cylinder t`o causereciprocation thereof, said valve means comprisinga main valve in thesaid tubing adapted to control the motor and provided with a springactuating the said valve, and an auxiliary valve in the tubing beneaththe main valve, a chamber adapted to be closed by the main valve, asecond chamber beneath the first one adapted to be closed by theauxiliary valve both chambers being provided with outlet* ducts, a rodextending from the body of the auxiliary valve and adapted to be liftedby the cylinder to open the auxiliary valve after the cylinder haspassed a certain way from its lowest position, the main valve beingcontrolled by theA the said valve, and an auxiliary valve in the tubingbeneath the main valve,4 a chamber adapted to be closed by the mainvalve, a. second chamber beneath the first one adapted to be closed bythe auxiliary valve both chambers being provided with outlet ducts, arod extending from the body of the auxiliary valve and adapted to belifted by the cylinder to open the auxiliary valve after the cylinderhas passed a certain way from its lowest position, the main valve beingcontrolled by the variation of the hydraulic pressure in connection withthe opening and closing of the-auxiliary valve.

8. In an impact boring mechanism actuated by flushing uld thecombination of a tubing, a piston mounted thereon, a cylinder slidablymounted on said piston, a boring tool carried by said cylinder and valvemeans for reversing the ow of fluid to said cylinder to causereciprocation thereof, said valve means comprising a main valve in .thesaid tubing adapted to control the motor and provided with a springadapted to close the said valve, and an auxiliary valve in the tubingbea cylinder slidably neath the main valve, a chamber adapted to beclosed by the main valve. a second chamber beneath the first one adaptedto be closed by the auxiliary valve both chambers being provided4 withoutlet ducts, a rod extending from the body of the auxiliary valve andadapted to be lifted by the cylinder to open the auxiliary valve afterthe cylinder has passed a certain way from its lowest position, the mainvalve being controlled by the variation oi the hydraulic pressureinconnection with the opening and closing of the auxiliary valve.

9. In an impact boring mechanism actuated by flushing uid thecombination of a tubing, a piston mounted thereon, a cylinder slidablymounted on said piston, a boring tool carried by said cylinder and valvemeans for reversing the ow of fluid to said cylinder to causereciprocation thereof, said valve means comprising a main valve in thesaid tubing adapted to control the motor and provided with a,v spring.adapted to open and to close the said valve, and an auxiliary valve inthe tubing beneath the main valve, a chamber adapted to be closed by themain valve, a second chamber beneath-the rst one adapted to be closed bythe auxiliary valve both chambers being provided with outlet ducts, arod extending from the body of the auxiliary valve and adapted to belifted by the cylinder to open the auxiliary valve after the cylinderhas passed a certain way fromits lowest position, the main valve beingcontrolled by the variation of the hydraulic pressure in connection withthe opening and closing of the auxiliary valve.

THEO SEIFER.

